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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93a77f9aa7c61bd375da30052dd025f8df9711a52e5d522e192438587de70d6f' 
  AND token = '583bptg9fdU9hZLSMQBgByO9ED1u8AayytMxM15xSK0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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