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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83c45ceccfa2890f210eaf4120d628f2a34482ea7c34c7caba43899da06adbd6' 
  AND token = 'dtYU+MREzrHThX/k/o1JOtkI5TbN44QsKT4Vx579INg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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