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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f293e835788f789030cd7e8f52ebb30edfea32311da05e1795419cad6201400' 
  AND token = 'nEPRLfnVg/xCMd17aPyfe8sK8hiw+0JObJTN3Pz8giI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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