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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '44f8ea7586037077caebb56f76df35c267a30c9e90ed707aaf352e5645e6ea43' 
  AND token = 'LVFdarYj3ijHqF02kn4JmiVlIbzKCbLvsRbseOdhW7Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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