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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38b29bb7e0d295dc48cbbfb78b6e8f0b9e03176f7ba58152ec2b9557eeaca7c7' 
  AND token = 'UtvsG90IMuRke7EysP78cGNnezGlNECEtc5tD4tl9Ck=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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