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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b46bdc35bf5544ee30cd928a5b6b8efe8f3a0b65b82bbc51206affaa93a0a057' 
  AND token = 'sCQgFOIiEP/uZLq/sX35MT+Xsag6nbrQrLij7l8fqOY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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