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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4359e0db25b4a20afe0a8a992751b8d96ca9d4ecd905832d098659b07f757334' 
  AND token = 'QVK1NylJ/UF/rSKavdzoQZkZ218CZEeNPydfNLnH5Jc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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