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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1512645cee92495805fe8e6672866580c8f5e8e85c0023fdac94ec9b47f1be07' 
  AND token = '21RXJZ2ym9iTuhHXP5OCeD775hbbzmKrl7wnvbSg3mQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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