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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec924c7990addc85489cad6704d0e957b9eaed390e0320d7ad0c2a2a7400062d' 
  AND token = 'TMedYRzR/Q5XanSfS0jaNTZUv4WMem444sF4Db7gloo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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