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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f46cd949c7b855dea4eaa91a4e0ad013398c837012ebf57f7ec16c38ef4fe406' 
  AND token = 'y0Ou2d6XaWSzga+Ax59iTTcMHZSPWtyX/rgsAS4n5rc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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