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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd669c8a957abf8147e589a989d32549b116c1fe9b93baf3a51c15323431cb07c' 
  AND token = 'kQK5lSx/Xjj5e+fToKWDgjchDoVR5dmt2BWmDreErx4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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