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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a10579ed6dfde6fb945c96f4aba9fed4a8d908bb3fc180769e836cde4d863b9' 
  AND token = 'fbyp6XuEGX3bTBf9ZndA5E0zMSH6kOGxK2bAwDe5n24=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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