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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d7c1181c75bb24622305a3950e04a2b7b94895e5248d9e3b8e1ea6eaa59d34e' 
  AND token = 'eA5OJSKms8iEvw55Jxv7LugozWq48w3FzenlzQbvg34=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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