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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '079e5a2b622c45605f90005e37c96fc9c2cf455df83db7511521de8c0d500dbe' 
  AND token = 'mqY3ulD7Uec1tieyV84j/yz+zk+vlGNF0/MYJO88Y6A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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