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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2356937bdcc7f5bd0c9bc25366a3d21fb71ee91e8953d2cb8a41adb0dccfc1b4' 
  AND token = 'qghPKLK5CQZtSw2GOx8FdD6Hn0C/f4eUsN42BOOgKV0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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