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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e69a71b70935d29d978cee4245ca8e39babf443a1fb398390c55d5fd9b88c63' 
  AND token = 'bzXSxE5HrUDP8D8zTdGmiPgevdeYu6USuQN2YK6GNv4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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