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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e23bf68916864f9c419c6bb0a0332f2b2b07377cd7940743b7c28d4ba466798c' 
  AND token = 'dkqletEscgttONSAQB/yn+S1NEOtdwjdN/Q8nXEU2Yk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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