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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13090a815e86826addf072fd7ef6dab4d94ce52818acf854b0b562f0abc70a84' 
  AND token = 'vLtUMY4cVyKq87qm9FFpA1FjuX5RqUoqMwqhJYMVrt4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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