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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e2ddf2b4336908fa098ddde3194cf91e13c81f2d0c952f208ee203d215c5ee6' 
  AND token = 'vk6L2iuu7Ffal5pXWvWHIE97kTj5+vMrj/gVosI8rmY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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