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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ee90deb86d6c684f3e769c6bcd730d3e3d00434bc7f819cec24e2eeebe4295e' 
  AND token = 'sXqont1V2sRK3GIodQJegXixMg0yEHO46BD6vOoGQ/Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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