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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58b699ccffff7fb269b26ecd0288c2c40d193560da10a5d832a90c95cc272925' 
  AND token = 'NwT7PnfEgBlL19s7AgYImjxUZdYVA+B4IoJGZE48If8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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