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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b722e9ec5f1df25741302b95b591c58b6012148c9798062373cea912dcd00b17' 
  AND token = '6FarxzBm0wat3vkLPKpyOVBdpvJPlFkNxHwQS792PFQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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