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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19cf13afcabeddb49217920b4fcf1d29bb5dce17b8fd2213b18cc4fe2031cc8f' 
  AND token = 'PW51YBbHvCt+F3cul/cb3x7WXuPDnO/e48jwxr/Uvfg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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