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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c4d5df964ef4b664944b39da6ebceb4ac1aace0cd01b46f61b9f2d6e2926397' 
  AND token = 'bhWF35QSjEXF3YlnFTxgDEGFy6NbakDDfqojLKu13Vk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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