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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e447b74f59e36076c93f3dfaf74b3e6be3c715ba04ed2e196df0e4cff0088dc5' 
  AND token = '178RYiEn1S4qSUPw02l5FNPsMc0r/idFTxBt/dIBSLc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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