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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7637bf153546e38bcbaefb43688ee304fcf8e559ec14634b0fb9fdd78e64e1a' 
  AND token = '86WMTO98ur4LzTNl4quka64O10Hs+RGOOHNPZzE3aog=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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