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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85432e88a55b839d0f93c5a0faa294b6943d70b1aa57b20e95e188c07a10ec22' 
  AND token = 'p3JdxKJ3s2yOP3CuLn6bZ3e5b9nxIWXBrQDIHnLjwnM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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