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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae7932fe03cbbc22aec5885e397276a15500a77321930133435b89821fd7e8f2' 
  AND token = 'SRlddaSFrdfJKaSNlQQ22yS499tEp4oniOZ5PT4I3Fw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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