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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7dd0d4d16a4681fd95a2cc14849370f30bb9a8f59e5e68048b59f7493b24c3e' 
  AND token = 'n+tGWpNDEN16pQg+v1nPehfIMahuwNWSAnMP7RHy9Zs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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