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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0bc0130fc3e4e1b0f4a68122dec6c62c4c9d1de4fba5dc31f85c0fa02805a5b5' 
  AND token = 'j3l/3vu3nQuFDfYtiW/tp0FphuTreMsRkvsnEOK6F34=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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