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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6bbd27370d4de4543a6b85ec7c85a774b727d0b5dd87f0c52de79edd8525b777' 
  AND token = 'J7pvlEgEq98FBkXvChPASrRUp/5bFqmUn7RqtU8KGMo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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