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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f55692024b9a69b88f421d2ae69abf220e1e1c1d2904e0b75d0f6d387e17198d' 
  AND token = '56eUF862OzQgz36TPSr+xPQPHwPTPh08QZIEmNiF1zo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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