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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be5238adbbf983b610aa502ca943b9c29d569fbe70a7ed45f1ce738388ddfb77' 
  AND token = 'bcguGkmlwyYEJxbh126Ao8/cjvRUWJkAuQJ1mWBea9A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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