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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da71741dfb7b25b06648b988ac7084f88315c3504c2dabd7bd2e1c11476d9df9' 
  AND token = 'ZRt0+18BeFutIMZHJlnEtt2/mnXht9Cqj/R0TcfE4AY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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