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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9fd014c4d9019a22f12e50c86cbe93bc4350ee1d7b130ad6b3871a9a2a4618ab' 
  AND token = '7vXi92jkG6h5CfQRJLkXcxfQFiZPI3P4SdTKtUvDI6M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00067

JSON explain

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