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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5fedeb6943dcb193fe019a316f3c61ebbe452107e4bd8d8f4cda2e19031996f6' 
  AND token = '73eB8gRsjQUfNI/xZPaLA59XCRDd6vphFoX+Mi1x95g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00065

JSON explain

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