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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4e6c55e81b521793b3b49445587965040dd268144275acdd9827cbffe6894c2' 
  AND token = 'N59x0WGzWfuc6zBJWL8FlnJL0kvnLdJ7VZzBugiMiN4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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