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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '44580bd5f5f453db9e942b6041e122e8d3af9eee5ebabb84099b4d38d8210bed' 
  AND token = '89VSfWjfheye3K0cTweGIpbxncbzgb5ZnI5tv1eYpKk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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