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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae2ac31a3fe7be0802a50a6f98734322cfaca8170377320cd6860c3a6e5d6d6c' 
  AND token = '73QpXFk37BjHvRKg0EWft8JcItQmBIlKWn77N78s0uA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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