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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c951984d8cb02ccc058c6c899c67bc50e177e011e4378099062d92eeedf6924b' 
  AND token = 'KpW4x0gFTzQwO3p7QRjdo24kWfpKXwp78edP7yvRQsY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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