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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19ff540f488ec07dffa4a516edc8037540c911c8736956bc4c69c0f806a00c5c' 
  AND token = '9zJsEBKXKYI6hS2NuOj3aHmoSz8Du/tV/534zqJoik4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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