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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c859ba9d76721d2c104925a776e07e66bdef9b095a1be5546f02ec4cf8c6132' 
  AND token = 'bqMEaerooVhMU9LNIG3j8qx64RnD0dARgeLThyOAH7I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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