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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa5f40f0559ba454a71302ee0aa8fa72362dbff65c9989c4e942cd1c40c10c5d' 
  AND token = 'eHi899hM1YqoWRi8Q7deLLTaAdr1uvx7Yewp4Q75SmA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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