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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5843b553e11cedbdf0b60c1aa3a6c5a552bc151560f56a56d3fd4492eb01df80' 
  AND token = 'wrDHApEmIV99sPlQtRU6/tGbyTvr7nByz7TS31zl3kw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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