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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c5544ecc374e30f34911073fbb6d4392b7a1ff01d72ebe6cc90df1a2f00cdbc8' 
  AND token = 'KBU0OVzPIgAreNs5TEh544Y0RlUayx+FA89TaIi0i1s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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