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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '184ef98167226e8c357c59a84d7674e2b36a771ff6382af19eb79287210848c5' 
  AND token = '7muVyCYV1ITH6p2S5TZhbYl0qb0LRGp3DiNTQ4uh4fU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}