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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '72ed317fa633cdbbf980d96233b14590ea84bbbe7c982b886a4d981a8d5573c3' 
  AND token = 'Wxtyvg9uXcF4GxXtTtG9/oEa0NOdJUeZ6qg3dplMkrk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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