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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '57d5b1ef91b7f59b0698e0d30d5d04da81aaa32e3be3e471d4fc2336c498d89e' 
  AND token = 'BgnH4tryetc9hxLFz/os+kbPlsXu/L6NKLHPUgjzkbM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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