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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b353260c11b12c12833cc39fc5b026baf6f9b43e5f7073728706d896c64f2dea' 
  AND token = 'rYNpbrb8aBW4Wz5VO6CCO/M9KwynLuCXYxm+cxS7KLo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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