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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7bfbd3ee6db02b253ae68195c953b2ad4561fb6786a7598f64c8d4d8252d04ab' 
  AND token = 'n1CCpzI1CqNKULxQkSmDN6JkWaRSrfT1Hme4+PL1WzI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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