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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71d5c12e445bdbff00651183e0078c71fd169d522e35cbccb0d46206b8413741' 
  AND token = 'S24ySBtKgUWlzu0SdLoo9h4QKQyWc/lDtOdd/A94CQ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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