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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6576cd6b5484c3d9ca1889e2ad7b7948e9cca0c9a025cdabd957a58b579872ea' 
  AND token = '6GbyoiZO8GxPl6QaL5Koxsq233VxsWNXJfKnJw1Tm4w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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