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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bcbfd0add950c89e636e4cd4ee80b5afac0c28cea93e0dfa3a044d1010bb3b5d' 
  AND token = '1kbZc57mhPrhGzVV2cYAyt7uw/MzjoVd9VftSZaI5xs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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