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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '490265cfc6a64be565082ef9aad2f57e9d69ab627f2c3766439180d4c56670a2' 
  AND token = 'ptHxHQQqvqwRNYBUidjrbfS8EvKk9ry3gT99njC4g38=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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