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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47c974012c275851f22b3059fd85b03fcc6e69ca1af58c44908d870c61c991b5' 
  AND token = 'hfxB2VzP4i/GPZSyqTmX13K7nfcKV6ee2O1KCvW+hd0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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