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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '904037f1c58c04793f3e0830264085e62121a0c3760794f0ed211d944b306981' 
  AND token = '/b4EUHfrvjZECIn/liuAHvRYU5cZq11j3QhVUY/4Wnc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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