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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6da915f34c0d39e5b3462ee50ade2154916af840b72add5eaebc036f202feeec' 
  AND token = 'PXIb9I5NP+XYQY090z65Mo3GC0iWViR6BbFp1lWjkfE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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