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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a7a1bd040848d51dc597f678737da27b24a3504392bdd85d4b052fb8b1d07bc' 
  AND token = 'J3s242dOmOvwgBK/io6vHg4x5QaolQNhPuV+lJd890A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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