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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5d13d9cb132fc6e11bef8c90f6a78ec171d19f11c16e80b1acf25623fa845c6' 
  AND token = 'VkfYuB8TYopEVWh5fGOZ1czKL8md9pPxc0EiX1l3hs4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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