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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6055aa8a43b010b8adf99767ea72bb243345407946dbd089f16374d9b04b3db0' 
  AND token = 'DuQ0KriZ5Juy1LA7KSuhZ2Hi9QvsmJvU0Omqg/10o0E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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