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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b20f0f4d61d2afe40ad0f946e5667048e18f3e9c124761bb66a36b580e6b3cf' 
  AND token = 'WsuUpxTHzjyUlCEZkw6N2OkE0NcDju+vg9MBtHirKag=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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