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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55ab9fc254726ba0eb9d336bf85109559613a11ceaf6d15b8cd41b2df7cbfc58' 
  AND token = 'ByaKGw8SaaTben5WKXmFUaRo07Yo8IgfxyFZDbgcH7U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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